Comparison of biofouling mechanisms between cellulose triacetate (CTA) and thin-film composite (TFC) polyamide forward osmosis membranes in osmotic membrane bioreactors

Wang, Xinhua; Zhao, Yanan; Yuan, Bo; Wang, Zhiwei; Li, Xiufen; Ren, Yueping

doi:10.1016/j.biortech.2015.11.087

Cited by 103 publications

(43 citation statements)

References 33 publications

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“…2). This observation is consistent with that reported previously and could be attributed to salinity build-up in the bioreactor and membrane fouling(Xiao et al, 2011;Wang et al, 2016). Salinity build-up in the bioreactor could increase the osmotic pressure in the mixed liquor side and thus reduce the net driving force (i.e.…”

supporting

confidence: 92%

Biomimetic aquaporin membranes for osmotic membrane bioreactors: Membrane performance and contaminant removal

Luo

Xie

Song

et al. 2018

Bioresource Technology

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In this study, we investigated the performance of an osmotic membrane bioreactor (OMBR) enabled by a novel biomimetic aquaporin forward osmosis (FO) membrane. Membrane performance and removal of 30 trace organic contaminants (TrOCs) were examined. Results show that the aquaporin FO membrane had better transport properties in comparison with conventional cellulose triacetate and polyamide thin-film composite FO membranes. In particular, the aquaporin FO membrane exhibited much lower salt permeability and thus smaller reverse salt flux, resulting in a less severe salinity build-up in the bioreactor during OMBR operation. During OMBR operation, the aquaporin FO membrane well complemented biological treatment for stable and excellent contaminant removal. All 30 TrOCs selected here were removed by over 85% regardless of their diverse properties. Such high and stable contaminant removal over OMBR operation also indicates the stability and compatibility of the aquaporin FO membrane in combination with activated sludge treatment.

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supporting

confidence: 92%

Biomimetic aquaporin membranes for osmotic membrane bioreactors: Membrane performance and contaminant removal

Luo

Xie

Song

et al. 2018

Bioresource Technology

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“…7, for OMBR reactor SMP and eEPS protein and carbohydrate concentrations increased considerably with operating time. The same trend was reported by Whang et al 42 who obtained a SMP concentration in polysaccharide and proteins on day 15 of operating three times higher than the initial value and an eEPS concentration (also in terms of polysaccharide and protein concentrations) twice that of the initial value. By contrast, the increase of total EPS was very slight.…”

Section: Comparison Of Ombr and Sbrsupporting

confidence: 88%

A comparative study of the influence of salt concentration on the performance of an osmotic membrane bioreactor and a sequencing batch reactor

Soler–Cabezas

Luján-Facundo

Mendoza–Roca

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND: An osmotic membrane bioreactor (OMBR) is a wastewater treatment technique that presents low energy requirements, low membrane fouling and high removal of nutrients and organic matter. However, reverse salt flux is the main disadvantage because it causes conductivity increase in the bioreactor. This study compares the performance of a sequencing batch reactor (SBR) and an OMBR in terms of chemical oxygen demand (COD) removal, soluble microbial products (SMP) and extracellular polymeric substances (EPS) production. For that, the influent conductivity in the SBR was increased as this increases conductivity in the osmotic membrane bioreactor.

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“…Therefore, in comparison, the CTA membrane showed better implications in the integrated MF-OMBR system, enabling higher TDS concentrations accumulation from inlet than in the TFC membrane. Moreover, more severe flux decline owing to membrane fouling is reported in the TFC membrane as compared to the CTA membrane, although biofouling is a challenge in CTA membranes [32]. Hence, it is evident that the FO membrane's water permeability and salt permeability are crucial for sustainable operation of the hybrid MF-OMBRs to enrich incoming nutrients.…”

Section: Tds Accumulation From High Fo Rejection Of Inlet Tds and Revmentioning

confidence: 99%

Nutrients Enrichment and Process Repercussions in Hybrid Microfiltration Osmotic Membrane Bioreactor: A Guideline for Forward Osmosis Development Based on Lab-Scale Experience

Gurung

Christensen

Sillanpää

et al. 2020

Water

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The effects of reverse salt diffusion through a forward osmosis membrane were studied in a microfiltration osmotic membrane bioreactor. The reactor was used to treat and simultaneously concentrate nutrients from wastewater. The system was operated at different draw solution concentrations, leading to varying salinity conditions. A relatively low, yet stable forward osmosis flux was observed regardless of increasing draw solution conductivities from 10 to 50 mS cm−1. A substantial increase in sludge conductivity from 5.7 to 19.8 mS cm−1 was observed during the operation. Batch transmembrane pressure-step experiments showed a decline in sludge filtration properties with increasing salinity buildup in sludge due to increasing deflocculation and associated release of protein and carbohydrate fractions of extracellular polymeric substances. Mathematical simulations showed that accumulation of total dissolved solids could mainly be attributed to reverse flux of salts from the draw solution rather than by the enrichment of incoming nutrients when forward osmosis membrane’s salt permeability was high and water permeability low. Ideally, salt permeability below 0.010 L m−2 h−1 and effective water permeability above 0.13 L m−2 h−1 bar−1 are crucial to ensure enhanced nutrient enrichment and reduce sludge osmotic pressure, microbial inactivation, sludge deflocculation and membrane fouling.

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Comparison of biofouling mechanisms between cellulose triacetate (CTA) and thin-film composite (TFC) polyamide forward osmosis membranes in osmotic membrane bioreactors

Cited by 103 publications

References 33 publications

Biomimetic aquaporin membranes for osmotic membrane bioreactors: Membrane performance and contaminant removal

Biomimetic aquaporin membranes for osmotic membrane bioreactors: Membrane performance and contaminant removal

A comparative study of the influence of salt concentration on the performance of an osmotic membrane bioreactor and a sequencing batch reactor

Nutrients Enrichment and Process Repercussions in Hybrid Microfiltration Osmotic Membrane Bioreactor: A Guideline for Forward Osmosis Development Based on Lab-Scale Experience

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